title: Acute myocardial infarction: estimation of at-risk and salvaged myocardium at myocardial perfusion SPECT 1 month after infarction.
abstract: OBJECTIVE
  To estimate at-risk and salvaged myocardium by using gated single photon emission computed tomography (SPECT) myocardial perfusion imaging after acute myocardial infarction (AMI).
  
  
  METHODS
  The study was approved by the hospital's Ethical Committee on Clinical Trials (trial register number, PR(HG)36/2000), and all patients gave informed consent. Forty patients (mean age, 61.78 years; eight women) with a first AMI underwent two gated SPECT examinations--one before percutaneous coronary intervention (PCI) and one 4-5 weeks after PCI. Myocardium at risk was estimated by assessing the perfusion defect at the first gated SPECT examination, and salvaged myocardium was estimated by assessing the risk area minus necrosis at the second examination. Myocardium at risk was estimated by determining the discordance between the areas of left ventricular (LV) wall motion and perfusion at the second examination. Concordance between tests was analyzed by means of linear regression analysis, the Pearson correlation, the intraclass correlation coefficient, and Bland-Altman analysis.
  
  
  RESULTS
  An improvement in perfusion, wall motion, wall thickening, and LV ejection fraction (P < .001) was observed at 1 month. At 1 month, the area with abnormal wall motion was greater than the area of altered perfusion (35.47 vs 23.1 cm(2); P = .007). The extent of myocardium at risk estimated from this discordance correlated well with myocardium at risk measured at the first gated SPECT examination and with salvaged myocardium between both studies (Pearson correlation: 0.78 and 0.6, respectively). Concordance for correct classification of patients with salvaged myocardium of 50% or greater was 83% (κ = 0.65).
  
  
  CONCLUSIONS
  Myocardial perfusion gated SPECT performed 1 month after early PCI in a first AMI provides potentially useful information on at-risk and salvaged myocardium.
  
  
  BACKGROUND
  http://radiology.rsna.org/lookup/suppl/doi:10.1148/radiol.13122324/-/DC1.
authors.affiliation: Departments of Cardiology, Nuclear Medicine, and Radiology, Hospital Universitari Vall d'Hebron, Vall d'Hebron Institut de Recerca, Universitat Autònoma de Barcelona, Paseo Vall d'Hebron 119-129, 08035 Barcelona, Spain.
authors.forename: Guillermo
authors.initials: G
authors.lastname: Romero-Farina
authors.forename: Santiago
authors.initials: S
authors.lastname: Aguadé-Bruix
authors.forename: Jaume
authors.initials: J
authors.lastname: Candell-Riera
authors.forename: M Nazarena
authors.initials: MN
authors.lastname: Pizzi
authors.forename: Victor
authors.initials: V
authors.lastname: Pineda
authors.forename: Jaume
authors.initials: J
authors.lastname: Figueras
authors.forename: Gemma
authors.initials: G
authors.lastname: Cuberas
authors.forename: Gustavo
authors.initials: G
authors.lastname: de León
authors.forename: Joan
authors.initials: J
authors.lastname: Castell-Conesa
authors.forename: David
authors.initials: D
authors.lastname: García-Dorado
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000000981:diagnostic imaging*; D055414:Myocardial Perfusion Imaging / Q000379:methods*; D011446:Prospective Studies; D018570:Risk Assessment; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods